Roll-grinding machine



May 8, 1928. 1,668,746

A. TURNER ROLL GRINDING MACHINE Filed March 12, 1925 4 Sheets-Sheet 1 18 I'orne May 8, 1928. 1,668,746

I A.TURNER ROLL GRINDING MACHINE Filed March 1'2, 1925 4 Sheets-Sheet 2 A. TURNER ROLL GRINDING MACHINE May s, 1928. 1,668,746

Filed March 12, 1925 4 Sheets-Sheet 3' 3/ 5? Wave 12,-

May s; 1928. 1,668,746

A. TURNER ROLL GRINDING MACHINE Filed March 12, 1925 4 Sheets-Sheet 4 iii (111111 I; J v

Patented May 8, 1928.

UNITED STATES PATENT OFFICE.

ALBERT TURNER, OF SHREW'SBUBY, MASSACHU SETTS, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO CINCINNATI GRINDERS INCORPORATED, 013 CINCINNATI, OHIO A. COB- rona'rron or 0110.

ROLL-GRINDING MACHINE.

1 L Application filed March 12, 1925. Serial No. 15,053.

This invention has reference to improvements in grinding machinery and more particularly to precision grinding apparatus employed in the production of Work of 8 circular sha e in cross section.

Such mac iinery in its broad aspect ordinarily comprises a bed, a work supporting table, and a grinding wheel, one of the two latter parts being laterally shiftable with 10 respect to the other, to cause a relative traversin movement of the work and tool or grin ing wheel when in operation.

The particular type of mechanlsm with which we are here concerned is that which is adapted for the production of either straight or plain cylindrical rolls, shafts, or the like, or for the production of Work pieces which may be frusto-conical, or of cambered shape; that is to say, work pieces which are of circular shape in cross section, but have some form of straight or curved longitudinal taper. I

Such work pieces in one adaptation are employed in metal rollin mills, where sub 2 ject to very heavy terminal pressure, the

purpose of the taper formation being that the roll, which might otherwisegspring centrally and bear unevenly on the metal being rolled, on account of its swelled central formation, when sprung under pressure, will tend to change from a bowed contact surface to a straight lower line of contact. It will be understood that rolls of this character are formed from quite heavy stock, fre- 36 quently 6" to 12 in diameter, and that the amount of tapering toward the ends is but slight, being measurable, for example, by thousandths of an inch, but nevertheless of prime importance'in production of propel rolled stock.

It is therefore the purpose of the present invention to provide a simple rugged and readily adjustable mechanism, which may be employed for precision grinding of either straight cylinders or of tapering rolls, such as just mentioned, and which in either event will produce work accurate to within .001".

A further object of the present invention is the provision of a machine for the purpose An additional object of the invention is e to the followin mentioned, which will automatically pro-' duce and preserve on the periphery of the,

the provision of an improved structure for the intended purpose, which ma be readily applied to present commercia forms of grinding machines without material alteration in the existing parts thereof,

Other objects and advantages of the invention should be readily apparent by reference specification taken in connection with tie accompanying drawings illustrative of one embodiment thereof. It

is to be understood that I may make any modifications in the s ecific details of construction or combination and arrangement of parts hereinafter disclosed within the .ciples of the invention.

Fi 1 represents a perspective view of a grin 'ing machine embodying my invention.

, Fig. 2 represents a plan view thereof.

Fig. 3 represents an enlarged fr en tary plan view of a slightly modifie construction.

Fig. 4' is a semi-diagrammatic plan view illustrating the'adjustment of parts for the production of concaved work.

Fig. 5 is a similar view showin the parts laterally shifted for truing the active face of the grinding wheel. I T

Fig. 6 is a section on the line 66 of Fig. 2.

Figure 7 is a horizontal section through one of the guide members and associate parts, taken on line 77 of Figure 1, and

Figure 8 is a vertical section as on line 8-8 of Figure 2.

In the drawings, the reference character A designates the bed of a precision grinder haying the wa s B for the table C and having bearings for the grinding wheel or tool member Ethese parts being of usual and. well-known construction and not requiring further detailed description. The bearings D are ordinarily mounted upon a transverse slide F, so that the wheel may be moved toward and from the work for proper feeding action.

In the present invention, there is mounted upon table- C a second or supplemental swinging table member 10, which may be ivotally supported on table C by stud 11 ibr longitudinal movement with the table and transverse oscillation with respect there to. This sup lemental table is provided with the suita 1y driven headstock G and tailstock H forsupporting and rotating the work'in opposition to the grinding wheel E.

action will be most readily understood by reference to Figure 3.

It will be understood that the members 17 and 18 are supported on the bracket or frame blocks 31 which are carried by the bed A of the machine through the medium of the pivots 32. These pivots hold the guides sufficiently spaced from the bed of the machine to permit of desired angular adjustment thereof as will be readily apparent by reference to Figures 7 and 8.

Since the adjustments in question are frequently of very minute amount, due to the slight camber to be produced on the roll being ground, difficulty might be experienced in accurate adjustment with ordinary screw mechanisms. I have therefore found it most advantageous to employ the pair of set screws 33 and 34 near opposite. ends of the 35 (guide member and of length to project into suitable engagement with the bed A of the machine. By loosening one of these screws and tightening the other the proper angular adjustment of the guide may be effected to within very fine limits.

To'properly cooperate with these guides there are secured at the ends of the supplemental table 10 the pair of forwardly curved arcuate arms 13 and 14 having suitably journaled therein the trunnions 19 and 20 respectively of the guide engaging shoes 15 and 16. It will thus be noted that with the machinemproperly assembled the shoes 15 and 16 will'be in engagementwith and ride along the adjustable guides 17 and 18 and on account of their pivotal connection to the arms 13 and 14 will automatically adjust or accommodate themselves to the an les at which the guides may be set through ad ustment of screws 33 and 34.

In the operation of the machine constructed in accordance with this invention the main table is given a longitudinal feeding movement across the face of the grindingwheel. This correspondingly laterally shifts the supplemental or swinging table 10 on account of the pivotal connection at 11 holding the parts against relative longitudinal movement. If the guide members 17 and 18 are set in a position parallel with the ways B angle as indicated in Figures find 3 .for

example, the guide at the side toward which the table is moving will exert a pulling action camming its contact shoe outwardly and thus swinging that end of the table outwardly so that the wheel will bite in more deeply atthe opposite end of the work piece. The engagement of the contact shoe and guide at the opposite end of the table limit this inward swinging as long as the table continues in the one direction and serves to reversely swing the table as it moves in the opposite direction. It will thus be seen that with the slight angular adjustment of the guides shown in Fig. 2 there will be generated a slight arc longitudinally of the work piece and the amount of this are will vary with the angle imparted to the guides. Similarly, if the guides be set in divergent relation as indicated in Fig. 4 the swinging will be in the opposite direction.

Since the shoe 16 will exert the tractile effort as the table 10 is moved to the left,

moving that end of the table outwardly so that the diameter of theroll gradually increases from center to end while the shoe 15 limits the inward swinging movement- To supplement this action a truing device such as K may be mounted in the tailstock so that on continued traversing movement of tables bringing the tailstock even with the wheel the truing device may operate upon the wheel surface to restore it to proper cutting condition and at the same time true it to the desired generative curve.

In the form shown the table and arms are illustrated as of considerable length while as the angle of the guides may be adjusted to very fine limits by the screw mechanism employed it is possible to produce on the work a barrel like or tapered cylindrical effect varying as little as a few thousandths of an inch from center to end, or in other words, to adjust the amount of normal center swell of a heat y roll so that when in use working pressure applied to the ends-of the roll will simply flatten the contacting surface thereof to a straight line in place of allowing it to spring in the middle and produce unequal transverse pressure as would otherwise be the case.

Inn

' piece, .the pivot stud 11 may simply be journaled in table 10, which has sufficient spring to allow for the necessary forward movement of the head or tailstock as the parts arereciprocated on the bed. When greater amount of cambering or tapering is desired, however, or, in any event, if preferred, the stud 11 may be rigidly secured to one table and have transverse sliding movement in the other; that is to say, it may, for example, be journaled in table 10, and have on its lower. end a block 26 sliding in slot 27 in table D, preferably being urged in the direction of the stone as by interposed spring 28.

In addition, to aid in controlling the position of the swivel table 10 on the sliding table C, table C is provided with a plurality of brackets 29, while interposed between said brackets and table 10. are the heavy coil springs 30, exercising a pressure forcing the table inward toward the stone. This movement is of course limited by the interengagement of the shoes 15 and 16 with the guides 17 and 18 and varies with the arcuate adjustment of the swivel table. Suitable adjusting devices 31 may be provided for varying the tension or pressure of the several springs. This is desirable, since the springs perform a double function. Primarily they urge the table and work toward the grinding wheel. In addition, they are necessary to overcome the inertia ofthe table toward swinging movement, due to the weight of the part 10, the work-supporting and driving members mounted thereon, and the friction between member 10 and. table C. If these springs were not present to overcome this inertia the outwardly riding arm 13 woultLspring or bow the table and thus the work before the opposite end of the table would begin its swlnging movement. While the effect here would be relatively slight, it might produce an error of several thousandths in the diameter of the work at the particular point afl'ecteda serious matter in a machine designed for accuracy within the limits of less than .001.

The tension of the springs is so adjusted as to overcome this friction inertia and tend at all times to force the table in and hold are set at equal angles to the table being in convergent relation for convex ork and divergent relation for concave work, as will be understood by comparison of Figures 2 and 4. A longitudinal movement is then given the slide table C on its ways and the work is shifted back and forth across the grinding wheel, the table 10 being longitudinally moved therewith on account of the interengagement of the pivot stud 11 with the two tables. 'As the tables are moved back and forth shoes 15 and 16 riding on guides 17 and 18 will cause the swinging movement previously described to be'imparted to' table 10 and thus to the work piece, generating a proper curve on the work piece. At the same time, on account of this generation of the curve by the swinging, a similar contrageneric curve will be produced on the periphery of the stone, so that the entire transverse operative surface of the stone will continuously be in contact with the work, obtaining maximum grinding efficiency, also a transverse continuous contact keep the stone true.

I claim-- 1. A machine of the character described including a tool, a support adjacent the tool, a table movable over the support, means for engagement of thework wheel, tending to longitudinally shifting said table, and means for oscillating the table as it is reciprocated, said latter means including a longitudinally shiftable positioning pivot for the table, spaced arms projecting from the table and angularly related guides on the support en- 1*" gaging said arms. I

2. A grinding machine including a bed, a grinding wheel supported thereby, ways on the bed extending transversely of the operative face of the grinding wheel, a table movable along said ways, a supplemental work supporting table mounted thereon, a

pivot connecting the main and supplemental tables for joint linear and relative oscilla tory movements, arms on the supplemental table extending forwardly therefrom, contact shoes pivotally secured to the arms, guide members on the bed in position for engagement by the shoes, and means for independently angularly adjusting the position of the guide members with resepct to the bed.

3. A grinding machine including a bed, a

grinding wheel supported thereby, ways on I the bed extending transversely of the oper- 3 ative face of the grinding wheel, a table movable along said ways, a supplemental work supporting table mounted thereon, a

pivot connecting the main and supplemental tables for joint linear and relative oscillatory movements, arms on the supplemental table extending forwardly therefrom, contact shoes pivotally secured to the arms, guide members on the bed in position for engagement by the shoes, means for independently 4. A grinding machine including a bed, a

grinding wheel carried thereby, ways on the bed extending transversely of the operative face of the grinding wheel, a main table anovable along said ways, a supplemental table carried by the main table, a pivot nontranslatably mounted in one of said tables and supported for limited sliding movement with respect to the other of said tables, angular guides carried by the bed, arms on the supplemental table having portions for engagement with the guides, and resilient means for centrally and terminally ur ing the supplemental table in the direction 0 the grinding wheel.

5. A grinding machineincluding a bed, a

4 grinding Wheel carried thereby, ways on the bed' extending transversely of the operative face of the grinding wheel, a main table movable along said ways, a supplemental table carried by the main table, a pivot nontranslatably mounted in one of said tables for centrally and terminally urging the supplemental table in the direction of the grinding wheel, and means for adjusting the effec- 'tive pressure of the resilient means.

6. A machine of the character described, including a bed, a grinding wheel supported by the bed, ways onthe bed extending transversely of the operative face of the grinding wheel, a main table movable along said ways, a supplemental table pivoted to the main table and having terminal arms curving forwardly therefrom, said arms terminating in depending contact shoes, guides on the bed in position to engage the. shoes, and means for individually angularly adjusting the guides to vary the efiective engagement thereof with the shoes on the arms.

In testimony whereof I hereunto set my hand this 5th day of March, 1925, at Cincinnati, Ohio.

ALBERT TURNER. 

